They feared that the potential emission of nitrogen oxides and water vapour from these aircraft would damage the ozone layer. (SSTs were designed to fly at altitudes coincident with the ozone layer, some 15 to 35 km [9 to 22 miles] above Earth’s surface.) In reality, the American SST program https://franciscoqtnzl.jaiblogs.com/42081228/la-regla-2-minuto-de-mediciones-ambientales-sgsst-normatividad